In recent decades, a number of research groups have been developing USCT imaging technologies for breast imaging applications [1]}, [2]}, [3]}, [4]}. In a typical breast USCT system, the patient lies prone on the imaging table and the breast to be imaged is submerged in water. An array of ultrasound transducers surrounds the breast. Each transducer emits an acoustic pulse one by one until the breast is insonified from all directions. During each shot, all other transducers act as receivers, recording the transmitted, scattered, and reflected wavefield data.
